presentation at NYC Search & Discovery Meetup

I presented at the NYC Search & Discovery Meetup on Thurs, Oct. 29.  The meetup is organized by Otis Gospodnetic (blog), who is one of the authors of Lucene in Action and the author of the upcoming book, Solr in Action. We make heavy use of Lucene and Solr on, so it was exciting to get an opportunity to present to a community of fellow technologists building systems with these excellent technologies.

Continue reading presentation at NYC Search & Discovery Meetup

Chase’s completely insecure and broken “secure” document exchange system (aka securedx, secure-dx)

A few days ago, I got a call from my girlfriend, Olivia. I was so deep in working on my startup,, that I hadn’t checked my bank account statements in several weeks. We just went into private beta last Thursday, after DreamIt Demo Day. She noticed some suspicious charges, and so I looked into them. Indeed, it looked like I had been a victim of fraud: there were three charges that clearly was not me.

I immediately called Chase Customer Service. In order to confirm the details about my account, the representative needed me to identify the fraudulent charges, but also identify charges that were actually valid. For this latter bit, I needed to identify the time/place of a specific transaction. This card was mostly used for online auto bill payments, so this turned out to be impossible for any of my last 20 valid payments. Yet the customer service rep insisted that I name a time and place. I told her, “The time and place was whenever the server for this system decided to automatically bill my account. I don’t know where their server is, I don’t know what time their cron jobs run.”

“Cron jobs?” she said.

Right, I had been hanging around techies at DreamIt Ventures for too long. “Listen, the transaction didn’t take place physically, it took place digitally. I can identify one transaction, which is about a month old, where I actually used the card in-person to buy something.” She finally understood and let me move on.

Burak from Trendsta said he felt bad for me, for how patient I had to be with this person. But that was the least of it. This little technical misunderstanding was nothing compared to what followed.

Continue reading Chase’s completely insecure and broken “secure” document exchange system (aka securedx, secure-dx)

For Linux/GNOME users: tired of nm-applet? Try wicd

This post is only intended for those who actually run GNOME and Linux, just a warning 🙂

I just replaced network-manager on my Ubuntu Jaunty desktop with wicd.  See wicd here:

What's so great about wicd?  I used to think nm-applet and NetworkManager were the best thing since sliced bread, but have grown increasingly frustrated with these tools over time.  Here's my short list of things I dislike about NM:

Continue reading For Linux/GNOME users: tired of nm-applet? Try wicd

Trouble connecting to GTalk with Pidgin?

After my recent upgrade to Pidgin 2.5.5 (on Ubuntu Jaunty), GTalk mysteriously stopped working.  Check out the FAQ entry on the Pidgin developer website for an explanation.  The workaround, not listed there, is to change your "Connect Server" to "".  Pidgin will then prompt you once for a certificate, and after that, it will connect fine.

A developer in #pidgin on told me to "fix my router" since my "router was broken".  This even though the problem has now occurred on three separate LANs, two of which I don't own/control.  Routers that are used as DNS servers are very common, and the fact they are broken in this regard is a reality.  Wake up — realities trump ideal every time.  Pidgin should automatically work around this problem, IMO.

Ubuntu Jaunty installation process

Today, I decided to finally sit down and upgrade my Ubuntu Intrepid installation to Ubuntu Jaunty. I torrented the live DVD last night (causing my roommates to complain of major Internet hoggage — it was downloading at 1.2MB/sec!). I then performed a full system backup to a remote hard drive, and then repartitioned my drives this morning using gparted, the graphical partition editor that comes with Jaunty’s live DVD.

The process took some time, which is why I saved it for a weekend. To backup my hard drive took about 2 hours, and doing the partitioning operations took about 3 hours. I went out in the nice weather and picked up groceries while it was loading.

When I got back and could kick off the installation process, I was pleasantly surprised by the installation wizard UI. It easily guided me through the partition setup process. Even though in my case I had to make use of the “Advanced” editor, it easily visualized what was going on in my hard drive, and even detected the operating systems I had on there (WinXP and Intrepid).

I set up my new ext3 partitions (after deciding ext4 too unstable for my taste), and got started. I was pleasantly surprised when instead of asking me to reboot my computer, it just started right up. I still had access to a functioning computer while it was installing! Nice. That allowed me to jump on my blog and start on this post 🙂 I even connected my MP3 player and have some tunes playing!

I was considering doing an upgrade of my system from Intrepid->Jaunty, but decided to give a clean installation a try. I get the feeling that there is some “drag” in my Linux installation which has been running on my machine for almost 3 years now. (Wow, has it been that long since I got this laptop?) I went through multiple releases of Ubuntu via upgrades, and I simply feel my requirements for my system have shrunk so significantly that a clean install was best to ensure my system is configured well and cleanly.

What do I mean by “shrunk” requirements? Well, when I profile the usage of my computer, nowadays 90% of what I do personally happens within Firefox. The remaining 10% are all handed by newer software. Among things that don’t include Firefox are browsing photos and listening to MP3s. Even some of these tasks are moving to the web platform.

For my work on Cog Tree, I really only have 3 development tools I lean on directly: vim, WingIDE (Python), and Eclipse IDE (Java). Javascript development and debugging happens inside a browser. I still lean on VMWare to give me some high-quality creative professional tools from the Windows world, e.g. Photoshop and Topstyle (for CSS). Aside from these, I don’t really need nor want much other software on my system. Any other development tools can be installed on-demand using Synaptic.

Jaunty’s installation percentage is about 50% right now. We’ll see how the system runs once it boots directly off the hard drive. I’m pleasantly surprised that most of my hardware seems to be working out of the box. Even my volume buttons, brightness buttons and media buttons on my laptop now work, which is a nice touch. My sound quality is still a little poor due to a chipset detection problem that still seems to be present in the snd_hda_intel driver. But I’m pretty sure by setting some options in /etc/modprobe.d/alsa-base I’ll be able to get it working better.

People who know me know that I’m very skeptical about my computer and about Linux. I regularly complain about all the little silly regressions that Linux has suffered over the years. I’m also particularly upset about how certain beautiful and essential pieces of software never end up making it into the Linux mainstream, e.g. TuxOnIce. But hopefully, Jaunty will capture my heart this time, and gain some love from this Linux cynic…

Favorite PyCon 2009 talks

I attended PyCon 2009 this year, which was a whole lot of fun. Quite a few people have asked me which talks I liked, so I decided to put together my “top 5 talks” list, in ranked order:

  1. A Whirlwind Excursion through Writing a C Extension. This talk by Ned Batchelder (author of and cog) shows that you can write a Python C extension module in under 20 minutes. This is my top talk because I never thought that my skills in C would be so directly useful in writing Python applications. Considering how damn easy it is to write a basic C extension module, I wouldn’t be surprised if the only reason I ever write C code again is to implement some Python functions or types in C. Truly the best of both worlds!
  2. Reinteract: a better way to interact with Python. Owen Taylor (of GNOME/GTK+ fame) has spent some time over the last few months building a better Python shell. Specifically, it’s a lightweight shell that is meant to be a prototyping or “worksheet” environment a la Matlab, Mathematica, or Maple. Except, you’re running and re-evaluating Python code. It even supports things like in-line graph plotting, but I’ve already used it to experiment with Python web services API. Any Python programmer who has been frustrated with IPython before should check out Reinteract.
  3. Easy AI with Python. This talk might have gotten the #1 slot for most interesting, but not the #1 slot overall because it seems like this talk has been given at a lot of conferences (not just PyCon) over the last few years. This talk introduces some complex AI topics in a very short time frame, and in a very intuitive way. For me, the neural networks example with Jets and Sharks was particularly impressive. Raymond Hettinger is a great presenter, and if you have some time you should definitely check out his recipes on ActiveState’s Python Cookbook and his How-to Guide for Descriptors.
  4. Abstraction as Leverage. A talk by one of my favorite Python authors, Alex Martelli (who wrote the best book on Python on the market, Python in a Nutshell), this talk isn’t so much about Python as it is about software engineering overall. But it’s thought-provoking as his talks usually are.
  5. Class Decorators: Radically Simple. The presenter is the author of the Class Decorators PEP, Jack Diederich. If you like decorators and you are curious about metaclasses, you’ll love class decorators.

Feel free to share your favorites!

Beautiful Code and a Beautiful Bug

I am teaching a technical course on the popular and ubiquitous version control system, Subversion, this Monday. I thought it might be fun to give my class a little “extra credit” reading from the O’Reilly book, Beautiful Code. In it, one of the original authors of Subversion, Karl Fogel, shares what he considers to be the most beautiful internal design within the codebase: the SVN delta editor. Though this API is not directly used in doing Subversion development, I thought it might be cool for students to have a deeper understanding of the thought that went into SVN’s codebase. But when trying to print up some copies of the chapter for the class, I got more than I bargained for…

Continue reading Beautiful Code and a Beautiful Bug